Two-sided compressor wheel of fluid compression device and manufacturing method thereof

ABSTRACT

A two-sided compressor wheel of a fluid compression device includes a first wheel part and a second wheel part. The first wheel part has a plurality of first blades. A first through hole is formed on the first wheel part along a rotation axis, and a first cavity is formed at a bottom of the first wheel part. The second wheel part has a plurality of second blades. A second through hole is formed on the second wheel part along the rotation axis, and communicated with the first through hole. Wherein, the bottom of the first wheel part is connected to a bottom of the second wheel part.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a two-sided compressor wheel of a fluid compression device, and more particularly, to a two-sided compressor wheel of a fluid compression device capable of increasing compression efficiency.

2. Description of the Prior Art

Generally, a turbo charger utilizes gas discharged from an internal combustion engine to drive a turbine rotor of the turbo charger to rotate, and the turbine rotor further boosts pressure of air in an intake passage of the internal combustion engine, so as to improve efficiency of the internal combustion engine. The turbine rotor of the turbo charger mainly comprises a turbine wheel, a compressor wheel and a rotor shaft connected to the turbine wheel and the compressor wheel. The turbine wheel is configured to be driven to rotate by air in an exhaust passage of the internal combustion engine, in order to further drive the compressor wheel to rotate. The compressor wheel further compresses the air in the intake passage of the internal combustion engine for improving efficiency of the internal combustion engine. In order to increase compression efficiency, the prior art provides a two-sided compressor wheel having blades at both sides. However, the two-sided compressor wheel is heavier, such that the turbine rotor takes longer time to achieve required rotation speed. Therefore, the two-sided compressor wheel of the turbo charger of the prior art increases turbine lag.

SUMMARY OF THE INVENTION

The present invention provides a two-sided compressor wheel of a fluid compression device capable of increasing compression efficiency and a manufacturing method thereof.

The two-sided compressor wheel of the fluid compression device comprises a first wheel part and a second wheel part. The first wheel part has a plurality of first blades. A first through hole is formed on the first wheel part along a rotation axis, and a first cavity is formed at a bottom of the first wheel part. The second wheel part has a plurality of second blades. A second through hole is formed on the second wheel part along the rotation axis, and communicated with the first through hole. Wherein, the bottom of the first wheel part is connected to a bottom of the second wheel part.

The manufacturing method of the two-sided compressor wheel of the fluid compression device comprises providing a first wheel part, wherein the first wheel part has a plurality of first blades, a first through hole is formed on the first wheel part along a rotation axis, a first cavity is formed at a bottom of the first wheel part; providing a second wheel part, wherein the second wheel part has a plurality of second blades, a second through hole is formed on the second wheel part along the rotation axis and communicated with the first through hole; and connecting the bottom of the first wheel part to a bottom of the second wheel part.

These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a first embodiment of a two-sided compressor wheel of a fluid compression device of the present invention.

FIG. 2 is a cross-sectional view of the two-sided compressor wheel of FIG. 1.

FIG. 3 is a diagram showing assembly of the two-sided compressor wheel of the fluid compression device of the present invention.

FIG. 4 is a diagram showing the two-sided compressor wheel of the present invention with a first wheel part and a second wheel part welded to each other through a welding material.

FIG. 5 is a diagram showing the two-sided compressor wheel of the present invention applied to a turbine rotor of a turbo charger.

FIG. 6 is a diagram showing a second embodiment of the two-sided compressor wheel of the fluid compression device of the present invention.

FIG. 7 is a cross-sectional view of the two-sided compressor wheel along line A-A of FIG. 6.

FIG. 8 is a diagram showing a third embodiment of the two-sided compressor wheel of the fluid compression device of the present invention.

FIG. 9 is a cross-sectional view of the two-sided compressor wheel along line A-A of FIG. 8.

FIG. 10 is a flowchart showing a manufacturing method of the two-sided compressor wheel of the fluid compression device of the present invention.

DETAILED DESCRIPTION

Please refer to FIG. 1 and FIG. 2. FIG. 1 is a diagram showing a first embodiment of a two-sided compressor wheel of a fluid compression device of the present invention. FIG. 2 is a cross-sectional view of the two-sided compressor wheel of FIG. 1. As shown in figures, the two-sided compressor wheel 100 of the fluid compression device of the present invention comprises a first wheel part 110 and a second wheel part 120. The first wheel part 110 has a plurality of first blades 112. The plurality of first blades 112 are configured to compress air when the two-sided compressor wheel 100 rotates. A first through hole 114 is formed on the first wheel part 110 along a rotation axis R of the two-sided compressor wheel 100, and a first cavity 116 is formed at a bottom of the first wheel part 110 and communicated with the first through hole 114. A radial size of the first cavity 116 is greater than a radial size of the first through hole 114. The second wheel part 120 has a plurality of second blades 122. The plurality of second blades 122 are configured to compress air when the two-sided compressor wheel 100 rotates. A second through hole 124 is formed on the second wheel part 120 along the rotation axis R of the two-sided compressor wheel 100, and a second cavity 126 is formed at a bottom of the second wheel part 120 and communicated with the second through hole 124. A radial size of the second cavity 126 is greater than a radial size of the second through hole 124. In addition, the first blades 112 and the second blades 122 are arrange to face opposite sides. The first through hole 114 is communicated with the second through hole 124, in order to allow a rotation shaft to pass through the two-sided compressor wheel 100.

Please refer to FIG. 3. FIG. 3 is a diagram showing assembly of the two-sided compressor wheel of the fluid compression device of the present invention. As shown in FIG. 3, the two-sided compressor wheel 100 of the present invention is formed by connecting the bottom of the first wheel part 110 to the bottom of the second wheel part 120. For example, the bottom of the first wheel part 110 is directly connected to the bottom of the second wheel part 120 by welding (such as by friction welding or electron beam welding) in order to form the two-sided compressor wheel 100 of the present invention. When the bottom of the first wheel part 110 is welded to the bottom of the second wheel part 120 by electron beam welding, electron beams can be concentrated on an interface between the bottom of the first wheel part 110 and the bottom of the second wheel part 120.

On the other hand, the bottom of the first wheel part 110 can be welded to the bottom of the second wheel part 120 through a welding material in order to form the two-sided compressor wheel 100 of the present invention. Please refer to FIG. 4. FIG. 4 is a diagram showing the two-sided compressor wheel of the present invention with the first wheel part and the second wheel part welded to each other through a welding material. As shown in FIG. 4, the two-sided compressor wheel 100 of the present invention can further comprise a welding material layer 130 formed between the bottom of the first wheel part 110 and the bottom of the second wheel part 120. As such, the bottom of the first wheel part 110 can be welded to the bottom of the second wheel part 120 through the welding material layer 130 in order to form the two-sided compressor wheel 100 of the present invention.

Please refer to FIG. 5. FIG. 5 is a diagram showing the two-sided compressor wheel of the present invention applied to a turbine rotor of a turbo charger. As shown in FIG. 5, the turbine rotor 10 of the present invention comprises a turbine wheel 20, a two-sided compressor wheel 100 and a rotor shaft 30 connected between the turbine wheel 20 and the two-sided compressor wheel 100. The turbine wheel 20 is configured to be driven to rotate by air in an exhaust passage of an internal combustion engine, in order to further drive the two-sided compressor wheel 100 to rotate. The two-sided compressor wheel 100 further compresses air in an intake passage of the internal combustion engine so as to increase efficiency of the internal combustion engine. Since the first blades 112 and the second blades 122 are respectively formed at two sides of the two-sided compressor wheel 100, compression efficiency for the air in the intake passage of the internal combustion engine can be improved. On the other hand, in addition to the first through hole 114 and the second through hole 124, a hollow structure is formed by the first cavity 116 and the second cavity 126 in the two-sided compressor wheel 100, so as to reduce weight of the two-sided compressor wheel 100. The two-sided compressor wheel 100 can be driven by a smaller force in order to further increase the compression efficiency for the air in the intake passage of the internal combustion engine. Moreover, since the weight of the two-sided compressor wheel 100 is reduced, the turbine rotor 10 can achieve required rotation speed in a shorter time, so as to reduce turbo lag.

On the other hand, the two-sided compressor wheel 100 of the present invention can be applied to other fluid compression devices, such as a vacuum cleaner, a hair dryer, etc. The two-sided compressor wheel 100 of the present invention can be connected to a power source (such as a motor) through a shaft, in order to compress air during rotation.

Please refer to FIG. 6 and FIG. 7. FIG. 6 is a diagram showing a second embodiment of the two-sided compressor wheel of the fluid compression device of the present invention. FIG. 7 is a cross-sectional view of the two-sided compressor wheel along line A-A of FIG. 6. As shown in figures, in the second embodiment of the two-sided compressor wheel 200 of the present invention, a plurality of (or at least one) first positioning structures 218 are formed at the bottom of the first wheel part 210, and a plurality of (or at least one) second positioning structures 228 are formed at the bottom of the second wheel part 220. A shape of the second positioning structure 228 corresponds to a shape of the first positioning structure 218, and the second positioning structure 228 is configured to be engaged with the first positioning structure 218. The first positioning structure 218 and the second positioning structure 228 are configured to prevent the first wheel part 210 from being moved or rotated relative to the second wheel part 220 during the welding process, in order to prevent misalignment between the first wheel part 210 and the second wheel part 220, so as to improve welding efficiency.

In addition, quantities of the first positioning structure 218 and the second positioning structure 228 are not limited to the above embodiment. The two-sided compressor wheel 200 of the present invention can comprise at least one first positioning structure 218 and at least one second positioning structure 228 to achieve the same purposes.

Moreover, in the above embodiment, the first positioning structure 218 is protruded from the bottom of the first wheel part 210, and the second positioning structure 228 is recessed from the bottom of the second wheel part 220, in order to allow the first positioning structure 218 of the first wheel part 210 to engage with the second positioning structure 228 of the second wheel part 220. But the present invention is not limited thereto. In other embodiments of the present invention, the first positioning structure can be recessed from the bottom of the first wheel part 210, and the second positioning structure can be protruded from the bottom of the second wheel part 220; or the first positioning structures can be protruded structure and recessed structures, and the second positioning structures can also be protruded structures and recessed structures.

Similarly, the bottom of the first wheel part 210 can be directly connected to the bottom of the second wheel part 220 by welding (such as by friction welding or electron beam welding) in order to form the two-sided compressor wheel 200 of the present invention. Or, the two-sided compressor wheel 200 of the present invention can further comprise a welding material layer (not shown in figures) formed between the bottom of the first wheel part 210 and the bottom of the second wheel part 220. As such, the bottom of the first wheel part 210 can be welded to the bottom of the second wheel 220 through the welding material layer in order to form the two-sided compressor wheel 200 of the present invention.

Please refer to FIG. 8 and FIG. 9. FIG. 8 is a diagram showing a third embodiment of the two-sided compressor wheel of the fluid compression device of the present invention. FIG. 9 is a cross-sectional view of the two-sided compressor wheel along line A-A of FIG. 8. As shown in figures, in the third embodiment of the two-sided compressor wheel 300 of the present invention, a plurality of first cavities 316 are formed at the bottom of the first wheel part 310, and a plurality of second cavities 326 are formed at the bottom of the second wheel part 320. The first cavities 316 are not communicated with the first through hole 314. The second cavities 326 are not communicated with the second through hole 324.

In addition, quantities of the first cavities 316 and the second cavities 326 are not limited to the above embodiment. The two-sided compressor wheel 300 of the present invention comprises can comprise a ring-shaped first cavity surrounding the first through hole 314 and a ring-shaped second cavity surrounding the second through hole 324 instead. Moreover, the first wheel part 310 and the second wheel part 320 of the two-sided compressor wheel 300 can further comprise corresponding positioning structures engaged with each other.

Similarly, the bottom of the first wheel part 310 can be directly connected to the bottom of the second wheel part 320 by welding (such as by friction welding or electron beam welding) in order to form the two-sided compressor wheel 300 of the present invention. Or, the two-sided compressor wheel 300 of the present invention can further comprise a welding material layer (not shown in figures) formed between the bottom of the first wheel part 310 and the bottom of the second wheel part 320. As such, the bottom of the first wheel part 310 can be welded to the bottom of the second wheel 320 through the welding material layer in order to form the two-sided compressor wheel 300 of the present invention.

On the other hand, the first wheel part 110, 210, 310 and the second wheel part 120, 220, 320 of the two-sided compressor wheel 100, 200, 300 of the present invention are not necessary to be symmetric. For example, the two-sided compressor wheels 100, 200, 300 of the present invention can be formed with the cavity (or cavities) on only one wheel part. Or, when the cavities are formed on the first wheel part 110, 210, 310 and the second wheel part 120, 220, 320, shapes, positions, and quantities of the first cavities and the second cavities can be different. In addition, dimensions of the first through hole 114, 214, 314 and the second through hole 124, 224, 324 can be different, and contours of the first blades 112, 212, 312 and the second blades 122, 222, 322 can also be different.

Moreover, the two-sided compressor wheels 100, 200, 300 of the present invention can be made of metal, but the present invention is not limited thereto. Connection between the first wheel part 110, 210, 310 to the second wheel part 120, 220, 320 is not limited to welding. The first wheel part 110, 210, 310 and the second wheel part 120, 220, 320 can also be connected to each other through an adhesive material.

Please refer to FIG. 10. FIG. 10 is a flowchart 400 showing a manufacturing method of the two-sided compressor wheel of the fluid compression device of the present invention. The manufacturing method of the two-sided compressor wheel of the fluid compression device of the present invention comprises the following steps:

Step 410: Provide a first wheel part, wherein the first wheel part has a plurality of first blades, a first through hole is formed on the first wheel part along a rotation axis, a first cavity is formed at a bottom of the first wheel part; Step 420: Provide a second wheel part, wherein the second wheel part has a plurality of second blades, a second through hole is formed on the second wheel part along the rotation axis and communicated with the first through hole; and Step 430: Connect the bottom of the first wheel part to a bottom of the second wheel part.

In addition, the manufacturing method of the two-sided compressor wheel of the present invention need not be in the exact order shown. Other steps can be intermediate.

In contrast to the prior art, the hollow structure is formed inside the two-sided compressor wheel of the fluid compression device of the present invention, such that the weight of the two-sided compressor wheel can be reduced in order to further increase compression efficiency of the fluid compression device. Moreover, since the weight of the two-sided compressor wheel is reduced, when the two-sided compressor wheel of the present invention is applied to a turbine rotor of a turbo charger, the turbine rotor can achieve required rotation speed in a shorter time, so as to reduce turbo lag.

Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims. 

What is claimed is:
 1. A two-sided compressor wheel of a fluid compression device, comprising: a first wheel part having a plurality of first blades, a first through hole being formed on the first wheel part along a rotation axis, and a first cavity being formed at a bottom of the first wheel part; a second wheel part having a plurality of second blades, a second through hole being formed on the second wheel part along the rotation axis and communicated with the first through hole; wherein the bottom of the first wheel part is connected to a bottom of the second wheel part.
 2. The two-sided compressor wheel of claim 1, wherein the first cavity is communicated with the first through hole, and a radial size of the first cavity is greater than a radial size of the first through hole.
 3. The two-sided compressor wheel of claim 1, wherein the first cavity is not communicated with the first through hole.
 4. The two-sided compressor wheel of claim 1, wherein a second cavity is formed at the bottom of the second wheel part.
 5. The two-sided compressor wheel of claim 4, wherein the second cavity is communicated with the second through hole, and a radial size of the second cavity is greater than a radial size of the second through hole.
 6. The two-sided compressor wheel of claim 4, wherein the second cavity is not communicated with the second through hole.
 7. The two-sided compressor wheel of claim 1, wherein at least one first positioning structure is formed at the bottom of the first wheel part, at least one second positioning structure is formed at the bottom of the second wheel part and corresponding to the at least one first positioning structure, the at least one second positioning structure is engaged with the at least one first positioning structure.
 8. The two-sided compressor wheel of claim 7, wherein the at least one first positioning structure is protruded from the bottom of the first wheel part.
 9. The two-sided compressor wheel of claim 7, wherein the at least one first positioning structure is recessed from the bottom of the first wheel part.
 10. The two-sided compressor wheel of claim 1, further comprising a welding material layer connected between the bottom of the first wheel part and the bottom of the second wheel part.
 11. A method for manufacturing a two-sided compressor wheel of a fluid compression device, comprising: providing a first wheel part, wherein the first wheel part has a plurality of first blades, a first through hole is formed on the first wheel part along a rotation axis, and at least one first cavity is formed at a bottom of the first wheel part; providing a second wheel part, wherein the second wheel part has a plurality of second blades, a second through hole is formed on the second wheel part along the rotation axis and communicated with the first through hole; and connecting the bottom of the first wheel part to a bottom of the second wheel part.
 12. The manufacturing method of claim 11, wherein a first positioning structure is formed at the bottom of the first wheel part, a second positioning structure is formed at the bottom of the second wheel part and corresponding to the first positioning structure, the manufacturing method further comprises engaging the second positioning structure with the first positioning structure.
 13. The manufacturing method of claim 11, wherein the bottom of the first wheel part is directly welded to the bottom of the second wheel part.
 14. The manufacturing method of claim 11, the bottom of the first wheel part is welded to the bottom of the second wheel part through a welding material. 